[tip:mm/pkeys] generic syscalls: Wire up memory protection keys syscalls

[tip-bot for Dave Hansen]

Commit-ID:  a60f7b69d92c0142c80a30d669a76b617b7f6879
Gitweb:     http://git.kernel.org/tip/a60f7b69d92c0142c80a30d669a76b617b7f6879
Author:     Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
AuthorDate: Fri, 29 Jul 2016 09:30:18 -0700
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 9 Sep 2016 13:02:27 +0200

generic syscalls: Wire up memory protection keys syscalls

These new syscalls are implemented as generic code, so enable them for
architectures like arm64 which use the generic syscall table.

According to Arnd:

  Even if the support is x86 specific for the forseeable future, it may be
  good to reserve the number just in case.  The other architecture specific
  syscall lists are usually left to the individual arch maintainers, most a
  lot of the newer architectures share this table.

Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Cc: linux-arch@xxxxxxxxxxxxxxx
Cc: Dave Hansen <dave@xxxxxxxx>
Cc: mgorman@xxxxxxxxxxxxxxxxxxx
Cc: linux-api@xxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx
Cc: luto@xxxxxxxxxx
Cc: akpm@xxxxxxxxxxxxxxxxxxxx
Cc: torvalds@xxxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20160729163018.505A6875@xxxxxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

---
 include/linux/syscalls.h          |  8 ++++++++
 include/uapi/asm-generic/unistd.h | 12 +++++++++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index d022390..0d7abb8 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -898,4 +898,12 @@ asmlinkage long sys_copy_file_range(int fd_in, loff_t __user *off_in,
 
 asmlinkage long sys_mlock2(unsigned long start, size_t len, int flags);
 
+asmlinkage long sys_pkey_mprotect(unsigned long start, size_t len,
+				  unsigned long prot, int pkey);
+asmlinkage long sys_pkey_alloc(unsigned long flags, unsigned long init_val);
+asmlinkage long sys_pkey_free(int pkey);
+//asmlinkage long sys_pkey_get(int pkey, unsigned long flags);
+//asmlinkage long sys_pkey_set(int pkey, unsigned long access_rights,
+//			     unsigned long flags);
+
 #endif
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index a26415b..dbfee7e 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -724,9 +724,19 @@ __SYSCALL(__NR_copy_file_range, sys_copy_file_range)
 __SC_COMP(__NR_preadv2, sys_preadv2, compat_sys_preadv2)
 #define __NR_pwritev2 287
 __SC_COMP(__NR_pwritev2, sys_pwritev2, compat_sys_pwritev2)
+#define __NR_pkey_mprotect 288
+__SYSCALL(__NR_pkey_mprotect, sys_pkey_mprotect)
+#define __NR_pkey_alloc 289
+__SYSCALL(__NR_pkey_alloc,    sys_pkey_alloc)
+#define __NR_pkey_free 290
+__SYSCALL(__NR_pkey_free,     sys_pkey_free)
+#define __NR_pkey_get 291
+//__SYSCALL(__NR_pkey_get,      sys_pkey_get)
+#define __NR_pkey_set 292
+//__SYSCALL(__NR_pkey_set,      sys_pkey_set)
 
 #undef __NR_syscalls
-#define __NR_syscalls 288
+#define __NR_syscalls 291
 
 /*
  * All syscalls below here should go away really,